(Professor Michela Massimi) In this module we will explore a central and ongoing debate in contemporary philosophy of science: whether or not scientific theories are true. Or better, whether a scientific theory needs to be 'true' to be good at all. The answer to this question comes in two main varieties. Scientific realists believe that theories ought to be true in order to be good. We will analyse their main argument for this claim (which goes under the name of 'no miracles argument'), and some prominent objections to it. Scientific antirealists, on the other hand, defend the view that there is nothing special about 'truth' and that scientific theories and scientific progress can be understood without appeal to it. The aim of this session is to present both views, their main arguments, and prospects.